Crossword Genius

Non-kosher Whopper? (4,3)

Ross

I believe the answer is:

pork pie

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'whopper?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for pork pie that I've seen before include "Melton Mowbray speciality - Cockney fib" , "sort of nut dressing" , "M eat and pastry dish" , "swallowed by gull" , "That isn't true" .)

I've seen this clue in the Sydney Morning Herald.
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